Answer: Heres the answers
Explanation:
NaBr gives fully seperated ions as Na⁺(aq) and Br⁻(aq) while AgBr gives partially dissociated ions as Ag⁺(aq) and Br⁻(aq).
NaBr(aq) →Na⁺(aq) + Br⁻(aq)
0.200 0.200
AgBr(s) ⇄ Ag⁺(aq) + Br⁻(aq)
Initial - -
Change -X +X +X
Equilibrium X X
Ksp = [Ag⁺(aq)] [ Br⁻(aq)]
7.7 × 10⁻¹³ = X * (0.200 + X)
7.7 × 10⁻¹³ = X² + 0.200X
0 = X² + 0.200X-7.7 × 10⁻¹³
X1 = 3.8 x 10⁻¹²
X2 = -0.2
X = molar solubility of AgBr.
hence, X cannot be a negative value.
molar solubility of AgBr is 3.8 x 10⁻¹² M.
Answer:
About 30.17 years
Explanation:
About 94.6% decays by beta emission to a metastable nuclear isomer of barium: barium-137m . The remainder directly populates the ground state of barium-137, which is stable.
When gas law is combined with the formula for kinetic energy, we have
KE = ½mv² = (3/2)kT
We can rearrange the equation to calculate for the velocity of the gas molecules from the temperature of gas as
v = (3RT/M)^(1/2)
We can see that the temperature is directly proportional to the velocity and that if the temperature is increased by a factor of four, the velocity of the gas will increase by a factor of 2.
x = 10, y = 20/6
<h3>Further explanation</h3>
Given
one number is three times of the other
their arithmetic mean is 10
Required
The numbers
Solution
Suppose the numbers you are looking for are x and y, then :
x = 3y (equation 1)
The arithmetic mean : the average of values
(x+3y)/2=10
x+3y = 20 (equation 2)
Substitute equation 1 into equation 2
3y+3y=20
6y=20
y = 20/6
from equation 1 :
x= 3 x 20/6
x = 60/6
x = 10